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For those who don't know, the Tendo is a device which you can use to measure the peak/avg. velocity of your lifts. I've always wanted one, but at $1600 (http://store.sorinex.com/Tendo-Weightlifting-Analyzer-p/t-2.htm) it was way out of my price range.
Velocity is maximum at the middle of the oscillation, i.e when the bob is at the bottom of the swing. PE is mass, multiplied by acceleration due to gravity and height. thus PE is maximum when the velocity is zero at the top of swing , i.e. at the top of the oscillation when the bob is at rest.